JP2006252659A - Content playback method, communication method, player, portable player, vehicle and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content playback system or the like which can request the reproduction of the content data stored in a portable player (107) and a player (103) through any device connected with them to communicate. <P>SOLUTION: The portable players in the content playback system transmits the list information showing the list of the content data they store to the player connected with them for communication. The player collects the information of the lists of the content data stored in the various portable players connected with it for communication and transmits the whole list information (307) to the portable players, and accepts at least one selection included in the identification information to discriminate the content data written in the whole list information (307, 308), then either one of the player and the portable players reproduces the content data corresponding to the selected identification information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a content reproduction method, a communication method, a reproduction device, a portable reproduction device, a vehicle, and a computer program.

  Currently, in-vehicle audio systems that can reproduce content data such as music in a car such as an automobile are generally used. In such an audio system, content data recorded on a recording medium such as a CD or MD is reproduced and output to a speaker or the like.

  In addition, there is a system in which one or more content data that can be played back by an audio system is read from a source device (such as a portable terminal) owned by a passenger in the vehicle, played, and output to a speaker (for example, , See Patent Document 1).

JP 2003-196919 A

  However, other than the content data stored in the source device owned by the user, the audio system can only be requested to reproduce the content data, and there can be no means for grasping the content data owned by a passenger other than the own device. , It was not possible to request the audio system to reproduce the content data of other passengers.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a portable playback device that is communicably connected in a vehicle and content data stored in the playback device from any of the communication-connected devices. To provide a new and improved content playback system, communication method, playback device, portable playback device, vehicle, and computer program capable of requesting and playing back.

  In order to solve the above problems, according to a first aspect of the present invention, there is provided a content playback system including a playback device and one or more portable playback devices connected to the playback device. The portable playback device in the content playback system transmits list information indicating a list of content data stored in the content playback system to the playback device that is connected for communication; Collects list information indicating a list of content data stored in the portable playback device, stores the collected list information linked with device identification information for identifying the portable playback device that owns the list information, and All list information including the collected list information and the list information of content data stored in the playback device itself is transmitted to the portable playback device; the portable playback device stores the entire list information transmitted from the playback device The portable playback device displays all list information on the screen; the portable playback device displays the content described in the full list information. Receiving selection of at least one piece of identification information from identification information for identifying data; one of the playback device and the portable playback device playing back content data corresponding to the selected identification information Yes.

  In order to solve the above-described problem, according to another aspect of the present invention, the portable playback device transmits list information indicating a list of content data stored in the mobile playback device to the communication-connected playback device; Receiving all list information including list information collected from a portable playback device that is communicatively connected to and list information of content data stored in the playback device; storing all list information transmitted from the playback device; Displays list information on the screen; accepts selection of at least one identification information from identification information for identifying content data described in all list information, and reproduces selected content data corresponding to the selected identification information A communication method characterized by instructing is provided.

  According to the present invention, the playback device collects list information transmitted from the portable playback device that is communicatively connected to the playback device, and creates all list information together with the list information of the playback device itself. All list information created by the playback device is stored in the storage unit of each portable playback device. If selection of at least one piece of identification information among all the list information stored in the portable reproduction device is accepted, reproduction of content data (or selected content data) corresponding to the identification information accepted for selection is instructed. According to this configuration, each device does not hold all the content data held by the playback device and the portable playback device that is communicatively connected to the playback device, and all the identification information corresponding to all the content data is at least described. Since each device has list information, it is possible to instruct reproduction of content data from any device based on all list information without imposing a burden on the storage capacity of each device. The communication connection may be either wireless or wired. The selected content data means content data itself that has been selected by the playback device or portable playback device from the user.

  In the communication method, when the selected content data is stored in the portable playback device, the selected content data is played back, and playback data generated by playback of the selected content data is transmitted to the playback device. It may be configured.

  In the communication method, when the selected content data is stored in the portable playback device, the playback data generated by playback of the selected content data is played back in parallel with playback of the selected content data. You may comprise so that it may transmit to. With this configuration, the playback device can advance the timing of receiving playback data, and can output playback data in real time. The reproduction data can be exemplified by an audio signal and / or a video signal after the content data is decoded.

  The communication method may be configured to transmit a reproduction command for instructing to reproduce the selected content data to the reproduction device when the selected content data is not stored in the portable reproduction device as a source of selection. . With this configuration, even if the portable reception device that receives the selection does not store the selected content data, the selected content data can be reproduced by the reproduction device or another portable reproduction device.

  The communication method may be configured to transmit the selected content data to the playback device in a streaming format when the selected content data is stored in the portable receiving device itself as a selection receiving source. With this configuration, the portable receiving device itself as the selection receiving source does not need a process such as a decoding process, and can reproduce the content data while reducing its processing load.

  The selected content data transmitted in the streaming format may be configured to be transmitted to the playback device even when the portable playback device can decrypt the data. With this configuration, the portable receiving device itself that accepts the selection does not need any processing such as decoding processing, and the reproducing device with higher processing capability than the portable playing device executes decoding processing and the like while reducing its own processing load. Therefore, the content data can be smoothly reproduced with high quality.

  The selected content data in the streaming format may be played on the playback device, and playback data generated by playing back the selected content data may be received.

  The communication method further receives a playback command for instructing to play back the selected content data from the playback device when the selected content data transmitted in the streaming format cannot be played back on the playback device; You may comprise so that selection content data may be reproduced | regenerated.

  The communication method may be further configured to transmit all processed list information to the playback device when the identification information described in all list information stored in the portable playback device is processed. With this configuration, even when all the list information distributed and held in each portable playback device and playback device is processed (added, deleted, changed, etc.), the contents of all list information can be unified without content mismatch.

  In order to solve the above-described problem, according to another aspect of the present invention, a playback device can display a list of content data stored in the mobile playback device from one or more mobile playback devices connected to the playback device. By receiving the list information shown, the list information from the portable playback device is collected; the collected list information of the portable playback device is identified by device identification information that identifies the portable playback device that owns the list information. There is provided a communication method characterized in that all the list information including the list information and the list information of the content data stored in the playback device itself is transmitted to the portable playback device.

  According to the present invention, the playback device collects list information transmitted from the portable playback device that is communicatively connected to the playback device, and creates all list information together with the list information of the playback device itself. All list information created by the playback device is stored in the storage unit of each portable playback device. Further, the playback device stores the list information of each portable playback device in its own storage unit in association with the device identification information. According to this configuration, each device does not hold all the content data held by the playback device and the portable playback device that is communicatively connected to the playback device, and all the identification information corresponding to all the content data is at least described. Since each device has list information, content data can be specified from any device based on all list information without imposing a burden on the storage capacity of each device. In the communication method, the selection of at least one identification information among the identification information for identifying the content data described in the all list information is accepted by the portable playback device, and the selected identification information is included in the selected identification information. When the selection receiving source portable playback device stores the corresponding selected content data, the selected content data is played back on the mobile playback device, and the playback data of the selected content data generated by the playback is received You may comprise as follows.

  In the communication method, the selection of at least one identification information among the identification information for identifying the content data described in the all list information is received by the portable playback device, and the communication method corresponds to the selected identification information. When the selected content data is stored in the portable playback device of the selection receiving source, the selected content data is played back on the mobile playback device, and the playback data of the selected content data generated in parallel with the playback is received. You may comprise.

  In the communication method, the selection of at least one identification information from the identification information for identifying the content data described in the all list information is received by the portable playback device, and the selection corresponding to the selected identification information is performed. When the portable data receiving device itself that does not accept the content data stores it, it receives a reproduction command for instructing to reproduce the selected content data from the portable reproduction device that is the selection accepting source; A device for storing the selected content data is identified by referring to the entire list information; as a result of the above identification, when the device for storing the selected content data is another portable playback device excluding the portable playback device of the selection receiving source , It may be configured to transmit a playback command of the selected content data to the other portable playback device. .

  In the communication method, the selection of at least one identification information from the identification information for identifying the content data described in the all list information is received by the portable playback device, and the selection corresponding to the selected identification information is performed. When the content data is stored in the portable receiving device as the selection receiving source, the selected content data transmitted in the streaming format from the portable receiving device as the selection receiving source may be received.

  The selected content data transmitted in the streaming format may be reproduced, and the reproduction data generated by the reproduction of the content data may be transmitted to the portable reproduction device that is connected to the reproduction device.

  The communication method further determines whether or not the selected content data transmitted in the streaming format can be played back; if the selected content data cannot be played back as a result of the determination, the communication method determines whether the selected content data is stored in the portable receiving device that stores the selected content data. The selected content data playback command is transmitted, and the selected content data is played back in response to the playback command on the portable playback device of the selection receiving source, and the playback data of the selected content data generated in parallel with the received playback data is received. You may comprise.

  The received playback data may be configured to be transmitted to a portable playback device that is communicatively connected to the playback device, and the received playback data is a selection receiving source mobile playback device that is communicatively connected to the playback device. You may comprise so that it may transmit to the portable reproducing apparatus except for.

  The selected content data transmitted in the streaming format may be received, and the selected content data may be transmitted to the portable playback device connected to the playback device, or the selected content transmitted in the streaming format. Data may be received, and the selected content data may be transmitted to a portable playback device other than the selection-accepting portable playback device that is communicatively connected to the playback device.

  The communication method further receives all processed list information from the portable playback device when the identification information described in all list information stored in the portable playback device is processed; You may comprise so that all list information may be updated to all list information after a process.

  The communication method may further be configured to transmit all processed list information to a portable playback device that is communicatively connected to the playback device.

  As described above, according to the present invention, a portable playback device and a playback device that are communicably connected in a vehicle request content playback from either the portable playback device or the playback device, and playback is performed. can do.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, components having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted.

(1. Content playback system)
First, the content reproduction system 100 according to the first embodiment will be described with reference to FIGS. FIG. 1 is an explanatory diagram showing an example of an overview of an automobile equipped with a content reproduction system according to the first embodiment, and FIG. 2 is an example of a schematic example of the content reproduction system according to the first embodiment. It is explanatory drawing which showed.

  The content reproduction system 100 according to the first embodiment is a system that mainly reproduces content and outputs audio and / or images. The content according to the present embodiment will be described by taking as an example a case where the content is composed of sound (for example, music), an image (for example, a photographic image), or a combination thereof (for example, a movie, a game). It is not limited to examples. In some cases, content is described as content data or the like.

  A content reproduction system is provided in the automobile 50 shown in FIG. More specifically, for example, a content reproduction system is provided near the driver's seat of the automobile 50 (for example, near the center console) or a door.

  As shown in FIG. 2 (a), a seat inside the car 50 includes a plurality of portable playback devices 107a, 107b,..., 107n (hereinafter collectively referred to as “portable playback device 107”) as components of the content playback system 100. There is also a case.)

  In addition, a plurality of audio output units 105a and 105b (hereinafter may be collectively referred to as “audio output unit 105”) as components of the content reproduction system 100 are provided at the top of the automobile 50, and in the vicinity of the center console. A playback device 103 is provided.

  The portable playback device 107 can communicate with the playback device 103 wirelessly or in a wired manner. The portable playback device 107 transmits the content data that the portable playback device 107 has to the playback device 103, for example, via the audio output unit 105 from the playback device 103. Audio related to the content data can be output. The audio output unit 105 according to the present embodiment can be exemplified by a speaker, for example.

  FIG. 2B shows a schematic configuration of the content reproduction system 100 according to the present embodiment. The content reproduction system 100 includes at least a reproduction device 103, an audio output unit 105, a portable reproduction device 107, and a network 109.

  Note that the case where the audio output unit 105 is separate from the playback device 103 will be described as an example. However, the audio output unit 105 is not limited to this example. For example, the audio output unit 105 is integrated with the playback device 103. But you can.

  The portable playback device 107 shown in FIG. 2 is placed on the holder 108 in the vehicle 50 as shown in FIG. The portable playback device 107 is connected so that it can communicate with the network 109.

  The network 109 connects the playback device 103 and the portable playback device 107 so that they can communicate with each other. The network 109 may be wired such as a USB cable or may be wireless. Further, as shown in FIG. 3, the network 109 transmits the reproduction data after decoding the content data from the portable reproduction device 107 to the reproduction device 103, in addition to the cable 109b (USB cable or the like) for data transmission / reception. The cable 109a may be configured to be used.

  The playback device 103 is a device capable of playing back content. More specifically, the playback device 103 is, for example, a navigation device (or car navigation device) having a content playback function. However, the playback device 103 is not limited to such an example, and the playback device 103 not only plays back content. An apparatus capable of recording may be used. Further, as long as the content can be reproduced, it can be constituted by, for example, an in-vehicle game machine, an in-vehicle DVD reproducing device, or the like.

  The portable playback device 107 is a device that can be carried and can play back content. More specifically, the portable playback device 107 is, for example, a mobile phone, but is not limited to such an example. For example, the portable playback device 107 may be a PDA (Personal Digital Assistant), a notebook PC (personal computer), or the like.

(Playback device)
Next, the playback device 103 according to the present embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing a schematic configuration of the playback apparatus 103 according to the present embodiment.

  As shown in FIG. 4, the playback device 103 includes a CPU (central processing unit) 130, a bus 131, a storage unit 133, an input / output interface 135, an operation unit 136, a display unit 137, and a communication unit 139. A wireless communication unit 140, a drive 141, and a content input unit 143.

  The CPU 130 controls processing / instructions and the like of each unit included in the production terminal device 114. In addition, a program for performing a series of processes related to content reproduction, such as a link process for linking list information and device ID (or device identification information), is started and executed.

  The storage unit 133 is a storage device that stores the program and the like, and examples thereof include a hard disk drive, an EEPROM (Electrically Erasable Programmable Read-Only Memory), and the like.

  The operation unit 136 includes one or more buttons that can receive an operation instruction from the user, a pointing device such as a trackball, a trackpad, a stylus pen, a dial log, or a joystick. It is not limited.

  The display unit 137 displays at least text, sound, moving images, still images, or any combination thereof relating to various genres such as literature, concerts, movies, and sports.

  The bus 131 is a general term for buses configured in the playback device 103 such as an internal bus, a memory bus, and an input / output (I / O) bus. The bus 131 transmits data sent from each unit to each unit that is the destination of the data.

  The communication unit 139 transmits or receives various types of information via a wired network 109 (109b). The wireless communication unit 140 modulates / demodulates and transmits or receives various information via the wireless network 109.

  The drive (content reproduction unit) 141 is a device that reproduces content data recorded on, for example, a CD or a DVD. Therefore, by placing a medium such as a CD or DVD on the tray, the drive 141 reads the content data recorded on the medium and outputs the content to the audio output unit 105 by performing a process such as decoding. be able to.

  The content input unit 143 accepts input of reproduction data transmitted from the portable reproduction device 107 via the network 109a. Note that the reproduction data is, for example, data (or a signal) generated by decoding (or decoding) content data by the portable reproduction device 107.

  A CPU (Central Processing Unit) 130 performs various processes according to a program stored in a ROM (Read Only Memory) 132 via a bus 131 or a program read from a storage unit 133 to a RAM (Random Access Memory) 134. Execute.

(Portable playback device 107)
Next, the portable playback device 107 according to the present embodiment will be described with reference to FIG. FIG. 5 is a block diagram showing a schematic configuration of the portable playback device 107 according to the present embodiment.

  The portable playback device 107 is a portable device (PD) that is a portable content playback device. More specifically, the portable playback device 107 is, for example, a mobile phone having a storage capacity of several tens of MB, but is not limited to such an example. For example, the portable playback device 107 has a storage capacity of several tens of GB. Various portable devices such as a portable audio player, a portable video / audio player, and a PDA that include a hard disk drive (HDD) may be used.

  As shown in FIG. 5, the portable playback device 107 includes a CPU 200, a bus 201, a storage unit 203, an input / output interface 205, an operation unit 206, an output unit 207, a communication unit 209, and a wireless communication unit 210. And a content output unit 212.

  Note that the CPU 200, bus 201, storage unit 203, input / output interface 205, operation unit 206, communication unit 209, and wireless communication unit 210 shown in FIG. 5 are substantially the same as those provided in the playback device 103 shown in FIG. Therefore, detailed description is omitted.

  The output unit 207 includes a display (display screen) for displaying video or video, a speaker for outputting sound, and the like.

  The content output unit 212 outputs reproduction data generated by decoding the content data to the outside via the network 109. For example, the reproduction data output from the content data output unit 212 is transmitted to the reproduction device 103, and the reproduction data is output to the audio output unit 105 of the reproduction device 103.

(Program in playback device)
Next, various modules applied to the playback apparatus 103 according to the present embodiment will be described with reference to FIG. FIG. 6 is an explanatory diagram showing an outline of various modules applied to the playback apparatus 103 according to the present embodiment.

  As shown in FIG. 6, there are a plurality of modules in the program for processing / operating the playback apparatus 103 according to the present embodiment. For example, the module is recorded in advance in the storage unit 133 provided in the playback device 103, and written into the RAM 134 or the like as necessary.

  As shown in FIG. 6, a program for processing / operating the playback apparatus 103 includes a collection module 601 for collecting list information, a specific module 603, a playback module 605, a link module 607, a transmission module 609, and a reception module. The module 611, the display module 613, the output module 615, the processing module 617, the receiving module 619, and the reproduction command module (or reproduction instruction unit) 621 are at least included.

  The specifying module 603 is a module for specifying the portable playback device 107 that holds the content data requested to be played based on all the linked list information of the playback device 103. All list information and stringing processing will be described later.

  The reproduction module 605 passes the reproduction data generated by decoding the content data to, for example, the display module 613 or the output module 615.

  The linking module 607 creates all list information by linking the received list information and the device ID of the portable playback device 107 that holds the list information, and stores the list information in the storage unit 133.

  The transmission module 609 transmits the reproduction data decoded by the reproduction module 605 to the portable reproduction device 107, transmits the content data as it is, or transmits other information to the outside.

  The display module 613 displays a moving image or a still image on the display unit 137 according to the decoded reproduction data. Similarly, the output module 615 outputs audio to the audio output unit 105 according to the decoded reproduction data.

  The processing module 617 is a module that changes all list information held by the playback apparatus 103 itself when all list information held by the external portable playback apparatus 107 is changed. It should be noted that the processing module 617 can also change all list information held by itself without changing all external list information.

  The receiving module 619 is a module that recognizes an instruction input by a user's operation on the operation unit 136 and transfers instruction information to each unit suitable for the content of the instruction. For example, when there is a content reproduction request from the user via the operation unit 136, the reception module 619 transfers reproduction instruction information in which identification information (such as a title) for identifying the content is described to the reproduction module 605.

  The playback command module 621 is a module that transmits a playback command for instructing an external portable playback device 107 connected via the network 109 to play back content when the playback device 103 itself cannot decode.

  The various modules (collection module 601 to reproduction instruction module 621) shown in FIG. 6 are called and stored in the RAM 134 from the storage unit 133 by the CPU 130, and each process is executed.

(About data structure)
Next, the data structure in the playback apparatus 103 according to the present embodiment will be described with reference to FIG. FIG. 7 is an explanatory diagram showing an example of a schematic data structure in the playback apparatus 103 according to the present embodiment.

  As shown in FIG. 7, the storage unit 133 has contents 1, 2, 3,..., A plurality of contents data 304 (hereinafter simply referred to as contents data or contents), and an identification for identifying the contents data 304. List information 302 in which information is described and all list information 308 are stored.

  In the list information 302, one or more identification information corresponding to the content data 304 stored in the storage unit 133 is described. Therefore, if the identification information is designated, the content data 304 can be uniquely specified. The identification information according to the present embodiment can exemplify the title of the content data, for example. However, the identification information is not limited to this example. For example, the identification information includes an ID number composed of one or more digits. It may be the case.

  The all list information 308 is list information composed of list information stored not only by the playback device 103 but also by all portable playback devices 107 connected to the playback device 103 and the network 109. Note that the list information is created by collecting the list information from all the portable playback devices 107 connected to the network 109. However, the present invention is not limited to such an example. If there is a portable playback device 107 that does not transmit / receive data to / from the portable playback device 107, all list information may be created from the list information of all the portable playback devices 107 except the portable playback device 107.

  That is, the all list information 308 describes identification information that can identify all the content data stored in the playback device 103 and the external portable playback device 107 that is connected in communication. Further, the identification information portion of the list information stored in the portable playback device 107 out of all the list information 308 stored in the playback device 103 is associated with the device ID of the portable playback device 107 that holds the list information. Have been). Details will be described later.

  Further, the description has been given by taking as an example the case where the entire list information 308 according to the present embodiment is another list information different from the list information 302. However, the present invention is not limited to such an example, and for example, the list information 302 is integrated. Alternatively, the entire list information 308 alone may be used.

  Next, the entire list information 308 stored in the playback device 103 according to the present embodiment will be described with reference to FIG. FIG. 8 is an explanatory diagram showing an example of an outline of all list information stored in the playback apparatus according to the present embodiment.

  As shown in FIG. 8, the entire list information 308 is stored in the storage unit 133 with the device ID (A1, B3, B3,...) And the identification information (content j, content k, content l,. Has been. The device ID is, for example, a unique ID for identifying the portable playback device 107 that is labeled at the time of manufacture, but is not limited to such an example.

  By attaching the device ID and the identification information to all the list information 308, it is possible to specify the portable playback device 107 that holds the content data corresponding to the identification information. As shown in FIG. 8, for example, the portable playback device 107 having the device ID “B3” holds the content data whose identification name is “content m”.

  The link module 607 receives the list information transmitted from the portable playback apparatus 107 together with the device ID held by the portable playback apparatus 107, links the list information and the device ID, and stores all list information 308 in the storage unit 133. I will remember as.

(Programs for portable playback devices)
Next, various modules applied to the portable playback device 107 according to the present embodiment will be described with reference to FIG. FIG. 9 is an explanatory diagram showing an outline of various modules applied to the portable playback device 107 according to the present embodiment.

  As shown in FIG. 6, a program for processing / operating the portable playback device 107 according to the present embodiment includes a plurality of modules. For example, the module is recorded in advance in the storage unit 203 provided in the portable playback device 107, and written into the RAM 204 or the like as necessary.

  As shown in FIG. 9, a program for processing / operating the portable playback device 107 includes a transmission module 901, a reception module 903, a processing module 905, a playback module 907, an output module 909, a display module 911, and an acceptance module. A module 913, a search module 915, and a reproduction command module (or reproduction instruction unit) 917 are at least included.

  The transmission module 901, the reception module 903, the processing module 905, the reproduction module 907, the output module 909, the display module 911, the reception module 913, and the reproduction instruction module 917 are the modules stored in the reproduction apparatus 103 described above. Since they are substantially the same, a detailed description is omitted.

  The search module 915 is a module that searches the storage unit 207 in its own apparatus for content data requested by the receiving module 913 via the operation unit 206 and requested to be reproduced. If the content data exists as a result of the search, the search module 915 requests the playback module 907 to decode, and if not, requests the playback command module 917 to transmit a playback command to the playback device 103.

  The various modules (transmission module 901 to playback instruction module 917) shown in FIG. 9 are called and stored in the RAM 204 from the storage unit 203 by the CPU 200, and each process is executed.

(data structure)
Next, the data structure in the portable playback device 107 according to the present embodiment will be described with reference to FIG. FIG. 10 is an explanatory diagram showing an example of a schematic data structure in the portable playback device 107 according to the present embodiment.

  As shown in FIG. 10, the storage unit 203 provided in the portable playback device 107 has contents A, B, C,..., A plurality of contents data (hereinafter simply referred to as contents data or contents) 303, and the contents. Stored is list information 301 in which identification information for identifying data 303 is described, full list information 307, and device ID 305.

  The list information 301 is substantially the same as the list information 302 in the playback device 103, and thus detailed description thereof is omitted.

  The all list information 307 has substantially the same configuration as that of the all list information 308 except that the device ID and the identification information are not associated with each other, and a detailed description thereof will be omitted.

  The device ID 305 is, for example, a unique ID that can uniquely identify the portable playback device 107 stored in the ROM 132 or the storage unit 203 at the time of manufacture, but is not limited to such an example.

(All list information creation process)
Next, processing for creating all list information according to the present embodiment will be described with reference to FIG. FIG. 11 is a sequence diagram showing an outline of the all list information creation processing according to the present embodiment.

  As shown in FIG. 11A, the playback apparatus 103 stores list information 302, the portable playback apparatus 107a stores list information 301a, and the portable playback apparatus 107c stores list information 301c. Has been.

  Next, as shown in FIG. 11B, when the portable playback device 107c is connected to the playback device 103 via the network 109, a communication connection between the portable playback device 107c and the playback device 103 is established.

  After the connection is established, the list information 301c is transmitted from the portable playback device 107c to the playback device 103, and the list information 302 is transmitted from the playback device 103 to the portable playback device 107c. The device ID is stored in the header portion of the transmission information of the list information 301c transmitted from the portable playback device 107 to the playback device 103.

  Next, as shown in FIG. 11C, when the receiving module 903 or the like in the portable playback device 107c receives the list information 302 from the playback device 103, the list information is stored in the list information 301c stored in its own storage unit 203. 302 is added.

  Similarly, when the reception module 611 or the like in the playback apparatus 103 receives the list information 301c, the link module 607 links the device ID described in the received header or the like with the received list information 301c, and creates a list. Information 301 c is added to list information 302. At this time, the link module 607 of the playback device 103 associates the port number on the playback device 103 side when connected to the portable playback device 107 via the network 109, the connection terminal, and the like with the device ID. May be stored.

  Further, as shown in FIG. 11D, when the portable playback device 107a is connected to the playback device 103 via the network 109, a communication connection between the portable playback device 107a and the playback device 103 is established.

  After the connection is established, list information 301a is transmitted from the portable playback device 107a to the playback device 103, and list information 302 and list information 301a are transmitted from the playback device 103 to the portable playback device 107c. A device ID is stored in the header portion of the transmission information including the list information 302 and the list information 301a transmitted from the portable playback device 107a to the playback device 103.

  Further, the list information 301 a held by the portable playback device 107 a is transmitted from the playback device 103 to the portable playback device 107 c that is already connected for communication via the network 109.

  Next, as shown in FIG. 11 (e), when the receiving module 903 or the like in the portable playback device 107a receives the list information 301c and the list information 302 from the playback device 103, the list information stored in its own storage unit 203 is stored. All list information 307 is created by adding list information 301c and list information 302 to 301a. Similarly, the portable playback device 107c also creates all list information 307.

  When the receiving module 611 or the like in the playback apparatus 103 receives the list information 301a, as described above, the device ID described in the received transmission information and the like is linked to the received list information 301a to obtain the list information. All list information 308 is created by further adding 301a to the list information 302 to which the list information 301c is added. At this time, the link module 607 of the playback apparatus 103 associates the device ID with the port number or connection terminal ID of the mobile playback apparatus 107a when the mobile playback apparatus 107a is connected to the mobile playback apparatus 107a via the network 109. May be stored. This is the end of the description of the series of processes for creating all list information according to the present embodiment.

  By creating all the list information, not only the playback device 103 holds the entire list information, but also all the list information is distributed to the portable playback device 107 that is connected to the playback device 103 in communication. Can be remembered. Therefore, it is possible to make a request from the portable playback device 107 to play back the content held by the playback device 103 or another portable playback device 107.

  In the process of creating all list information according to the present embodiment, the playback device 103 receives the list information held by the portable playback device 107 connected to the playback device 103 and the list information held by the playback device 103 itself. The process of adding the list information received from the portable playback device 107 to the list information of the playback device 103 in addition to the list information of the portable playback device 107 is performed in order for each portable playback device 107 connected in communication, and finally In the above description, the list information of the portable playback device 107 is added to the list information of the playback device 103, and the entire list information of the portable playback device 107 and the playback device 103 is created as an example. However, the present invention is not limited to this example. For example, in the process of creating all list information according to the present embodiment, the playback device 103 receives all the list information of each portable playback device 107 that is communicatively connected to the playback device 103, and the list information of the playback device 103 itself includes the above list information. By adding all the list information of each portable playback device 107, all list information is once created on the playback device 103 side, and the playback device 103 distributes the entire list information to each portable playback device 107. For example, all list information may be distributed and held in the portable playback device 107.

  Next, processing for playing back content according to the present embodiment will be described with reference to FIG. FIG. 12 is a sequence diagram showing an outline of the content reproduction process according to the present embodiment.

  Regardless of whether the content is audio or video, as shown in FIG. 12, the process of playing back the content is first described by the receiving module 913 in the all list information 307 via the operation unit 206 provided in the portable playback device 107. The reproduction of the content thus received is accepted (S1201). Note that the processing for accepting the reproduction of the content (S1201) may be executed by the playback device 103, and the playback device 103 and each portable playback device 107 hold all list information 307 and 308.

  Next, the portable playback device 107c that has received the playback request searches the corresponding content data from the content data stored in the storage unit 203 in order to confirm whether or not the content data is stored in the mobile playback device 107c. S1203).

  If there is content data as a result of the search, the portable playback device 107 decodes the content data and transmits the playback data to the playback device 103 (S1205). The playback device 103 receives the playback data and outputs it directly to the audio output unit 105 or the display unit 137.

  On the other hand, similarly, when the portable playback device 107a accepts playback of content data (S1207) and searches for content data (S1209), if the content data does not exist in its own storage unit 203, the playback command module 917 Is generated and transmitted to the playback device 103 (S1211).

  When the playback device 103 receives the playback command, the identification module 603 searches the content identification information described in the playback command based on the entire list information 308. If the identification information is detected as a result of the search, the portable playback device 107 is specified based on the device ID corresponding to the identification information on a one-to-one basis (S1213).

  Next, the playback command module 621 of the playback device 103 transmits a playback command to play back the content data to the portable playback device 107 that holds the content data requested to be played back (S1215).

  Note that the device ID of the portable playback device 107 that is the playback request destination is set in the header or the like of the playback command. When the portable playback device 107 corresponding to the set device ID receives the playback command, the content data is decoded.

  The playback command module 621 may transmit a playback command to all the portable playback devices 107 that are connected to the playback device 103. Also, the playback command module 621 polls the playback device 103 and establishes a connection with the mobile playback device 107 of the corresponding device ID. Later, it may be a case where a playback command is sent individually.

  If playback data is received from the portable playback device 107 after the playback command, the playback data is output to the audio output unit 105 or the display unit 137 as it is (S1217).

(Audio playback processing)
Next, with reference to FIG. 13, a reproduction process when the content is audio will be described. FIG. 13 is a sequence diagram showing an outline of content reproduction processing when the content is audio. Note that the playback device 103 has all list information 308, and the portable playback device 107 has all list information 307.

  First, as shown in FIG. 13, the receiving module 913 receives the content (audio 1B) described in the all list information 308 via the operation unit 206 provided in the portable playback device 107a (S1301).

  Next, the portable playback device 107a that has received the playback request searches the corresponding content data from the content data stored in the storage unit 203 in order to confirm whether or not the content data is stored by itself.

  If there is no content data as a result of the search, the playback command module 917 generates a playback command and transmits it to the playback device 103 (S1303).

  When the playback device 103 receives the playback command, the identification module 603 searches the content identification information described in the playback command based on the entire list information 308. If the identification information is detected as a result of the search, the portable playback device 107 is specified based on the device ID that has a one-to-one correspondence with the identification information (S1306).

  Next, the playback command module 621 of the playback device 103 transmits a playback command to play back the content data to the portable playback device 107c that holds the requested content data (S1309).

  The portable playback device 107c that has received the playback command from the playback device 103 reads content data (audio 1B data) that matches the identification information set in the playback command from the storage unit 203, and does not decode the content data in a streaming format. Is transmitted to the playback device 103 (S1311).

  Upon receiving the streaming format content data, the playback module 605 of the playback device 103 first confirms that the content is music content (S1313).

  Next, the playback module 605 determines whether or not the content data (audio 1B data) can be decoded (S1315). If the result of the determination is that decoding is impossible, the playback command module 621 commands the portable playback device 107c that is the transmission source to decode the audio 1B data (S1317).

  When the portable playback device 107c receives a decoding instruction from the playback device 103 (S1317), the portable playback device 107c decodes the audio 1B data (S1319) and transmits the decoded audio 1B data (playback data) to the playback device 103 (S1321). . Note that the playback data may be output to the output unit 207 of the portable playback device 107c.

  Note that the case where the transmission module 907 transmits the reproduction data to the reproduction apparatus 103 after the reproduction module 907 according to the present embodiment decodes the content data has been described as an example. However, the present invention is not limited to this example. For example, the transmission module 901 may transmit the decoded content data (reproduction data) to the reproduction apparatus 103 in parallel with the reproduction module 907 decoding the content data. Such processing can reduce the time for transmission processing.

  On the other hand, if the result of determination (S1315) indicates that decoding is possible, the playback module 605 decodes the audio 1B data (S1323).

  Finally, the playback data from the portable playback device 107c or itself (playback device 103) is output as audio (S1325), and the series of playback processing operations when the content data is audio are completed.

(Image playback processing: When playback device decodes)
Next, with reference to FIG. 14, a description will be given of a reproduction process when the content according to the first embodiment is a video (or video). FIG. 14 is a sequence diagram showing an outline of content reproduction processing when the content according to the first embodiment is a video. Note that the playback device 103 has all list information 308, and the portable playback device 107 has all list information 307.

  As shown in FIG. 14, the accepting module 913 accepts playback of the content (video 1A) described in the entire list information 308 via the operation unit 206 provided in the portable playback device 107a (S1401).

  Next, the portable playback device 107a that has received the playback request searches the corresponding content data from the content data stored in the storage unit 203 in order to confirm whether or not the content data is stored by itself.

  If there is no content data as a result of the search, the playback command module 917 generates a playback command and transmits it to the playback device 103 (S1403).

  When the playback device 103 receives the playback command, the identification module 603 searches the content identification information (video 1A) described in the playback command based on the entire list information 308. If the identification information is detected as a result of the search, the portable playback device 107 is specified based on the device ID that has a one-to-one correspondence with the identification information (S1405).

  Next, the playback command module 621 of the playback device 103 transmits a playback command to play back the content data to the portable playback device 107c that holds the content data requested to be played back (S1407).

  Receiving the playback command from the playback device 103, the portable playback device 107c reads the content data (video 1A data) that matches the identification information set in the playback command from the storage unit 203, and does not first decode the content data but performs streaming. The data is transmitted to the playback device 103 in a format (S1411).

  Upon receiving the streaming format content data, the playback module 605 of the playback device 103 first confirms that the content is video content (S1413).

  Next, the playback module 605 determines whether or not the content data (audio 1B data) can be decoded (S1415). If the result of the determination is that decoding is impossible, the playback command module 621 instructs the mobile playback device 107c as the transmission source to decode the video 1A data (S1417).

  Upon receiving a decoding instruction from the playback device 103 (S1419), the portable playback device 107c decodes the video 1A data (S1421), and transmits the decoded video 1A data (playback data) to the playback device 103 (S1423). . Note that the playback data may be displayed on the output unit 207 of the portable playback device 107c.

  Note that the case where the transmission module 907 transmits the reproduction data to the reproduction apparatus 103 after the reproduction module 907 according to the present embodiment decodes the content data has been described as an example. However, the present invention is not limited to this example. For example, the transmission module 901 may transmit the decoded content data (reproduction data) to the reproduction apparatus 103 in parallel with the reproduction module 907 decoding the content data. Such processing can reduce the time for transmission processing.

  In addition, when the portable playback device 107c does not receive a decoding instruction even after a predetermined time has elapsed after transmitting the content data (video 1A data) in the streaming format (S1417), the portable playback device 107c determines that there is no decoding instruction (S1419) Wait for playback data from the device 103.

  On the other hand, as a result of determining whether decoding is possible (S1415), if it is determined that decoding is possible, the playback module 605 decodes the audio 1B data (S1425).

  By decoding the video 1A data by the portable playback device 107c or the playback device 103, the generated playback data is transmitted to each portable playback device 107 connected via communication (S1427).

  Finally, the playback data generated by the portable playback device 107c or itself (playback device 103) is output as a video (S1429), and a series of playback processing operations when the content data is video are completed.

(Image playback processing: when the mobile playback device decodes)
Next, with reference to FIG. 15, a description will be given of a reproduction process when the content according to the second embodiment is a video. FIG. 15 is a sequence diagram showing an outline of content reproduction processing when the content according to the second embodiment is a video. Note that the playback device 103 has all list information 308, and the portable playback device 107 has all list information 307.

  Also, in the description of the reproduction process when the content according to the second embodiment is a video, the difference from the content reproduction process when the content according to the first embodiment is a video will be described in detail. The other points will be omitted because they are substantially the same.

  As shown in FIG. 15, the receiving module 913 receives the reproduction of the content (video 1A) described in the entire list information 308 via the operation unit 206 provided in the portable reproduction device 107a (S1501).

  Next, the portable playback device 107a that has received the playback request searches the corresponding content data from the content data stored in the storage unit 203 in order to confirm whether or not the content data is stored by itself.

  If there is no content data as a result of the search, the playback command module 917 generates a playback command and transmits it to the playback device 103 (S1503).

  When the playback device 103 receives the playback command, the identification module 603 searches the content identification information (video 1A) described in the playback command based on the entire list information 308. If the identification information is detected as a result of the search, the portable playback device 107 is specified based on the device ID that has a one-to-one correspondence with the identification information (S1505).

  Next, the playback command module 621 of the playback device 103 transmits a playback command to play back the content data to the portable playback device 107c that holds the content data requested to be played back (S1507).

  The portable playback device 107c that has received the playback command from the playback device 103 reads the content data (video 1A data) that matches the identification information set in the playback command from the storage unit 203, and does not decode the content data in a streaming format. Is transmitted to the playback apparatus 103 (S1511).

  Upon receiving the streaming format content data, the playback module 605 of the playback device 103 first confirms that the content is video content (S1513), and receives the streaming format video 1A data.

  When the reception of the streaming format video 1A data is completed, the transmission module 609 transmits the streaming format video 1A data to each portable playback device 107, and the playback command module 621 plays back to each portable playback device 107. Is instructed to do so (S1515).

  In the transmission process (S1515) according to the second embodiment, the case where the video 1A data is transmitted to the portable playback device 107c that is the source of the video 1A data has been described as an example. However, the present invention is not limited to this. For example, the present invention can be implemented even when content data is transmitted to each portable playback device 107 other than the portable playback device 107c.

  Next, each portable playback device 107 decodes the video 1A data (S1517), and outputs video and audio to the output unit 207 provided in each portable playback device 107. Thus, a series of operations of the reproduction process in the case where the content data according to the second embodiment is video is completed.

  Although the case where the playback module 907 according to the second embodiment decodes content data and outputs video and audio to the output unit 207 has been described as an example, the present invention is not limited to this example. The decoded content data (reproduced data) may be output to the output unit 207 in parallel with the reproduction module 907 decoding the content data. By such processing, it is possible to shorten the time until output to the output unit 207.

Although the description of the content reproduction system 100 according to the present embodiment has been completed, the content reproduction system 100 has the following excellent effects.
(1) All list information can be distributed and shared among each device of the playback device 103 provided in the content playback system 100 or one or more portable playback devices 107 connected in communication with the playback device 103.
(2) The user is unaware of which device stores the content data, and not only the playback device 103 but also the portable playback device 107 receives a request from the user to play the content data, and the playback device 103 or The portable playback device 107 can play back the content.
(3) Even when content data stored only in the portable playback device 107 is played back by the playback device 103, the user needs to transfer content data from the portable playback device 107 to the playback device 103 or transfer media and the like. The user can reproduce desired content data simply by specifying the content data. Therefore, it is possible to reduce the risk of content data being illegally copied from the portable playback device 107 to the playback device 103.

  The series of processes described above can be performed by dedicated hardware or software. When a series of processing is performed by software, a program constituting the software is installed in an information processing device such as a general-purpose computer or a microcomputer, and the information processing device is used as the playback device 103 and / or the portable playback device 107. Make it work.

  The program can be recorded in advance on a hard disk or ROM as a recording medium built in the computer. Alternatively, the program is not limited to a hard disk drive, but is a removable recording medium such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), a MO (Magneto Optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, and a semiconductor memory. Can be stored (recorded) temporarily or permanently.

  The program is installed on the computer from the removable recording medium 111 as described above, and is transferred from the download site to the computer wirelessly via a digital satellite broadcasting artificial satellite, or a LAN (Local Area Network), The program can be transferred to a computer via a network such as the Internet, and the program transferred in this way can be installed in a built-in hard disk or the like.

  Here, in this specification, the processing steps for describing a program for causing a computer to perform various processes do not necessarily have to be processed in time series in the order described in the flowchart, but in parallel or individually. This includes processing to be executed (for example, parallel processing or processing by an object). The program may be processed by one computer, or may be distributedly processed by a plurality of computers.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to this example. It is obvious for a person skilled in the art that various changes or modifications can be envisaged within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  In the above embodiment, in the content reproduction system 100, when content data is transmitted and received between the reproduction apparatus 103 and the portable reproduction apparatus 107, the case where the data is in a streaming format has been described as an example. However, the present invention is not limited to this example. For example, in the content reproduction system 100, when content data is transmitted and received between the reproduction device 103 and the portable reproduction device 107, the data can be implemented in a file format other than the streaming format.

  The present invention is applicable to a content reproduction method, a communication method, a reproduction device, a portable reproduction device, a vehicle, and a computer program.

It is explanatory drawing which showed an example of the general view of the motor vehicle provided with the content reproduction | regeneration system concerning 1st Embodiment. It is explanatory drawing which showed an example of the outline of the content reproduction | regeneration system concerning 1st Embodiment. It is explanatory drawing which shows the schematic structure by which the portable reproducing | regenerating apparatus concerning 1st Embodiment was set to the holder. It is a block diagram which shows schematic structure of the reproducing | regenerating apparatus concerning this Embodiment. It is a block diagram which shows schematic structure of the portable reproducing | regenerating apparatus concerning this Embodiment. It is explanatory drawing which shows the outline of the various modules applied to the reproducing | regenerating apparatus concerning this Embodiment. It is explanatory drawing which shows an example of the outline of the data structure in the reproducing | regenerating apparatus concerning this Embodiment. It is explanatory drawing which shows an example of the outline of all the list information which the reproducing | regenerating apparatus concerning this Embodiment memorize | stores. It is explanatory drawing which shows the outline of the various modules applied to the portable reproducing | regenerating apparatus concerning this Embodiment. It is explanatory drawing which shows an example of the outline of the data structure in the portable reproducing | regenerating apparatus concerning this Embodiment. It is a sequence diagram which shows the outline of the all list information creation process concerning this Embodiment. It is a sequence diagram which shows the outline of the content reproduction | regeneration processing concerning this Embodiment. It is a sequence diagram which shows the outline of the content reproduction | regeneration processing in case a content is an audio | voice. It is a sequence diagram which shows the outline of a content reproduction process in case the content which concerns on 1st Embodiment is a video. It is a sequence diagram which shows the outline of a content reproduction process in case the content which concerns on 2nd Embodiment is a video.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Content playback system 103 Playback apparatus 105 Audio | voice output part 107 Portable playback apparatus 109 Network

Claims (22)

A content playback system comprising a playback device and one or more portable playback devices communicatively connected to the playback device:
The portable playback device transmits list information indicating a list of content data stored in the portable playback device to the playback device connected for communication;
The playback device collects list information indicating a list of content data stored in the portable playback device from each portable playback device that is connected in communication with the playback device, and the collected list information is stored in the portable information source of the list information. A list of device identification information for identifying the playback device is stored, and all list information including the collected list information and the list information of the content data stored in the playback device itself is transmitted to the portable playback device;
The portable playback device stores the entire list information transmitted from the playback device;
The portable playback device displays the entire list information on a screen;
The portable playback device accepts selection of at least one piece of identification information from identification information for identifying content data described in the all list information;
One of the playback device and the portable playback device plays back the content data corresponding to the selected identification information. The portable playback device transmits list information indicating a list of content data stored in the portable playback device to the playback device connected for communication;
Receiving all list information including list information collected from a portable playback device communicatively connected to the playback device and list information of content data stored in the playback device;
Storing all the list information transmitted from the playback device;
Displaying all the list information on the screen;
Receiving selection of at least one piece of identification information from among pieces of identification information for identifying content data described in the all list information, and instructing reproduction of selected content data corresponding to the selected identification information ,Communication method. In the communication method, when the selected content data is stored in a portable playback device, the selected content data is reproduced based on the reproduction instruction, and the reproduction data generated by the reproduction of the selected content data is reproduced. The communication method according to claim 2, wherein the communication method is transmitted to the playback device. In the communication method, when the selected content data is not stored in the portable receiving device itself as the selection receiving source, the communication method transmits a playback command for instructing to play back the selected content data to the playback device. The communication method according to claim 2. The communication method further includes transmitting the selected content data to the playback device in a streaming format based on the playback instruction when the selected content data is stored in the portable playback device of the selection receiving source itself. The communication method according to claim 2, wherein: 6. The communication method according to claim 5, wherein the selected content data in the streaming format is played back on the playback device, and the playback data generated by playing back the selected content data is received. The communication method further includes:
When the selected content data transmitted in the streaming format cannot be reproduced on the reproduction device, a reproduction command for instructing to reproduce the selected content data is received from the reproduction device;
6. The communication method according to claim 5, wherein the selected content data is reproduced in accordance with the reproduction command. The communication method is further characterized in that when the identification information described in all list information stored in the portable playback device is processed, the processed all list information is transmitted to the playback device. Item 3. The communication method according to Item 2. The playback device receives list information indicating a list of content data stored in the mobile playback device from one or more mobile playback devices that are connected in communication with the playback device, so that the list information from the mobile playback device is received. Collect;
The collected portable playback device list information is stored in association with device identification information for identifying the portable playback device that owns the list information, and the list information and the content data list information stored by the playback device itself And transmitting all list information including the information to the portable playback device. In the communication method, the selection of at least one identification information among the identification information for identifying the content data described in the all list information is received by the portable playback device, and corresponds to the selected identification information. When the selected content data is stored in the portable playback device that is the source of selection, the selected content data is played back on the mobile playback device, and the playback data of the selected content data generated by the playback is received. The communication method according to claim 9, wherein: The communication method further accepts selection of at least one piece of identification information from the identification information for identifying the content data described in the all list information by the portable playback device, and corresponds to the selected identification information. Receiving a playback command for instructing to play back the selected content data from the portable receiving device of the selection acceptance source when the selected content receiving portable storage device itself does not store the selected content data;
The playback device identifies a device for storing the selected content data by referring to all list information of the playback device;
As a result of the identification, when the device that stores the selected content data is another portable playback device excluding the portable receiving device that is the source of selection, a playback instruction for the selected content data is sent to the other portable playback device. The communication method according to claim 9, wherein the communication method is transmitted. The communication method further accepts selection of at least one piece of identification information from the identification information for identifying the content data described in the all list information by the portable playback device, and corresponds to the selected identification information. 10. The selected content data transmitted in a streaming format from the portable receiving device of the selection receiving source is received when the selected content receiving portable storage device stores the selected content data. The communication method described in 1. 13. The selected content data transmitted in the streaming format is reproduced, and reproduction data generated by the reproduction of the content data is transmitted to a portable reproduction device that is communicatively connected to the reproduction device. The communication method described. The communication method further determines whether or not the selected content data transmitted in the streaming format can be reproduced;
If the selected content data cannot be reproduced as a result of the determination, a reproduction instruction for the selected content data is transmitted to the portable receiving device that is the source of the selection that stores the selected content data;
The selected content data is reproduced according to the reproduction command on the portable reception device of the selection receiving source, and the reproduction data of the selected content data generated in parallel with the reproduction content data is received. 12. The communication method according to 12. 15. The communication method according to claim 14, wherein the received reproduction data is transmitted to a portable reproduction device that is communicatively connected to the reproduction device. 13. The communication method according to claim 12, wherein the selected content data transmitted in the streaming format is received, and the selected content data is transmitted to a portable playback device that is communicatively connected to the playback device. The communication method further receives all list information after processing from the portable playback device when the identification information described in all list information stored in the portable playback device is processed;
The communication method according to claim 9, wherein all list information stored in the reproduction apparatus itself is updated to all list information after processing. A portable playback device in communication connection with a playback device:
A transmitting unit that transmits list information indicating a list of content data stored in the portable playback device itself to a playback device that is in communication connection;
A receiving unit that receives all list information including list information collected from a portable playback device that is communicatively connected to the playback device and list information of content data stored in the playback device;
A storage unit for storing the entire list information transmitted from the playback device;
A display for displaying the entire list information on a screen;
A reproduction instructing unit for accepting selection of at least one identification information from among identification information for identifying content data described in all the list information and instructing reproduction of the selected content data corresponding to the selected identification information; A portable playback device comprising: A playback device that is in communication connection with one or more portable playback devices:
A collection unit that collects list information from the portable playback device by receiving list information indicating a list of content data stored in the portable playback device from each portable playback device that is communicatively connected to the playback device itself When;
The collected portable playback device list information is stored in association with device identification information for identifying the portable playback device that owns the list information, and the list information and the content data list information stored by the playback device itself And a transmitting unit that transmits all list information including the information to the portable playback device. A vehicle that is in communication connection with one or more portable playback devices:
A collection unit that collects list information from the portable playback device by receiving list information indicating a list of content data stored in the portable playback device from each portable playback device that is communicatively connected to the vehicle itself; ;
The collected list information of portable playback devices is stored in association with device identification information for identifying the portable playback device that owns the list information, and the list information and the list information of the content data stored by the vehicle itself, And a transmitter for transmitting all list information including the information to the portable playback device. Transmitting list information indicating a list of content data stored in the portable playback device itself to the playback device connected for communication;
Receiving all list information including list information collected from a portable playback device communicatively connected to the playback device and list information of content data stored in the playback device;
Storing all the list information transmitted from the playback device;
Displaying all the list information on the screen;
A communication method for accepting selection of at least one piece of identification information from among pieces of identification information for identifying content data described in the entire list information and instructing the computer to reproduce selected content data corresponding to the selected identification information. A computer program characterized by being executed. Collection of list information from the portable playback device by receiving list information indicating a list of content data stored in the portable playback device from one or more portable playback devices connected to the playback device itself And
The collected portable playback device list information is stored in association with device identification information for identifying the portable playback device that owns the list information, and the list information and the content data list information stored by the playback device itself A computer program for causing a computer to execute a communication method for transmitting all list information including the information to the portable playback device.

Images